[Libvir] How libvirt handles QEMU?

Hello, I am new to libvirt, so have a question. My concern is: libvirt can manage QEMU VMs. The point is thatI QEMU doesnt not export monitor interface to outside (at least that is what I know about older version of QEMU, not sure if anything changed recently). So how can libvirt does something like: pause, resume or extract internal information about a QEMU VM? Thank you, Jun